This Fuel Injector Harness EV1 Type replaces 558-200 and is for use with Holley EFI ECUs. They are made in the USA, in-house, by EFI Conversions.
Skip Holley EFI's pricing and opt for one made in the USA with OE-quality parts. Designed for Multec 2 Fuel Injectors on LS engines. Get the quality you can trust by buying American, straight from the manufacturer.